Sources tell the new issue of UsWeekly (on stands now) that the former Disney stars grew restless as they grew up. "He wants to put his whole High School Musical past behind him and be known as a sexy solo actor like LeonardoDiCaprio," says the Efron insider. "He was ready to experience life as a single man."

Though sources close to the couple haven't ruled out a reconciliation, Hudgens clammed up when Us asked if she's still in touch with Efron.